The air-fuel mixture is compressed between the piston and cylinder head. This is called the compression stroke of the 4-stroke engine process. The intake valve closes and the piston returns back up the cylinder bore. Just after the piston moves to the bottom of its travel (bottom dead center), the cylinder bore contains the maximum air-fuel mixture possible. > Having performance problems? Find out how to troubleshoot carburetor repair and clean / maintain your small engine carburetors. This allows atmospheric pressure to force the air-fuel mixture into the cylinder bore as the piston moves downward. During the intake stroke, the intake valve between the carburetor and combustion chamber opens. It’s the job of the carburetor to supply a mixture of air and fuel that will allow for proper combustion.
In order to power your equipment, the overhead valve engine completes a repeating 4-step process detailed below.Įlement that Allow Internal Combustion Engines to RunĪir and fuel enter the small engine through the carburetor.
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